以石英玻璃粉为基体、硅酸锆为添加剂、陶瓷铸造蜡为增塑剂, 利用热压注法制备硅基陶瓷型芯, 烧结成型, 并测试了烧结后型芯性能的变化, 研究了硅酸锆添加量对硅基陶瓷型芯性能的影响. 结果表明: 硅酸锆添加量对型芯析晶并无明显影响. 由于硅酸锆熔点高、性能稳定, 不与二氧化硅发生反应, 能够降低石英玻璃的黏性流动和型芯的烧结程度, 导致硅酸锆添加量越多, 样品的收缩率、室温强度越低, 显气孔率越大. 少量硅酸锆分布于石英玻璃基体中, 起强化基体的骨架作用, 能够提高型芯的高温强度. 当硅酸锆含量较高时, 石英玻璃含量降低, 石英玻璃析晶产生的方石英含量降低, 导致型芯的高温强度下降. 型芯的高温挠度随硅酸锆含量的增加而降低, 这是因为硅酸锆在高温下能够降低石英玻璃的黏性流动.

The ceramic core was prepared using the hot injection method, where quartz glass powders were used as original materials, zircon as additive, and the ceramic casting wax as the plasticizer. The purpose is to test the changes in the properties of cores and the effect of zircon content on the properties of silica-based ceramic core. It was learned that the zircon additive has no obvious effect on core crystallization. Zircon, which has high melting point and stability, did not react with silica and could reduce the viscous flow of quartz glass and the degree of sintering of the core. As a result, the more zircon was added, the lower the shrinkage and room temperature strength were, and the greater the porosity was. A small amount of zircon, which was distributed in the quartz glass matrix, contributed to strengthening the matrix and also improved the high temperature strength of the core. When the content of zirconium silicate was high, the content of quartz glass decreased, and the content of quartzite which resulted from crystallization of quartz glass decreased as well, and this resulted in the lowering of high temperature strength. The high temperature deflection of the core decreased with the increase of the zircon content because zircon could reduce the viscous flow of quartz glass at high temperature.